Compilare: user.cpp: In function ‘void down(int, int)’: user.cpp:20:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<NrGrupuri[nod].size();++i) ^ user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Tree[nod].size();++i) ^ user.cpp: In function ‘void parcurgere(int, int)’: user.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Tree[nod].size();++i) ^